Heat induction head



March 11, 1958 J. E. AYRES HEAT INDUCTION HEAD 2 Sheets-Sheet 1 Filed Jan. 27, 1956 INVENTOR. an/was 5. awn-s March 11, 1958 J. E. AYRES HEAT INDUCTION HEAD 2 SheetsSheet 2 Filed Jan. 27, 1956 h g No ww M mu. M8 Q1 \%m w s N Wm W O m a.

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JflMis E. HV/PES ATTOPA IYJ -Unite States Patent HEAT INDUCTION HEAD James E. Ayres, Detroit, Mich, assignor to Induction Heating, Inc., Fostoria, Ohio, a corporation of Ohio Application January 27, 1956, Serial No. 561,753

Claims. (Cl. 219- 4049) This invention relates to a heat induction head and is particularly adapted to an apparatus for the heating of parts for heat-treatment purposes.

In my co-pending United States application Serial No. 515-,093, filed June 13, 1955, there is disclosed a complete apparatus for the heating treating of such parts as the'beari'ng portions of crank shafts, for example.

111 the heat treatment of certain surfaces which are cylindrical, it is essential that the heating be uniform around the device and that it be possible to assemble a heating :unit around the device readily to prevent delay around the part to be heated.

The present invention is primarily related then to the 'mountin of the 'o o'site ortions of an induction ring which can be closed about a part to be treated. The invention is also directed to the heating ring coil which can be made up of a multiplicity of turns and to the methodof cooling'the various parts of the coil.

ln the drawings:

Figure 1 illustrates a side elevation of an assembly of the device showing the parts in closed relationship.

Figure 2 is a horizontal section on line 2--2 of Figure 1.

Figures 3 to 8, inclusive,-are vertical sections taken on lines -3- 3 to 8-8, respectively, of Figure 1.

Referring to the drawings, a double turn-induction ring is shown'in Figure 1 in closed position. This ring is composed of separable jaws 'and 22, each of whichiare water cooled. Power is brought in from one of the jaws only by leads 24 and 26, which pass through and are clamped in an insulating block 30. These leads are grooved for the passageof water so that they may serve "simultaneously as cooling ducts. Notice that a segment "32 of the block 30 is separable and clamped thereto to h'oldrthe leads in place, the leads being separated by non conductive material. Bolts 34--hold the parts together.

As the leads reach the left-hand end of the block as viewed in Figures 1 and 2, they diverge in two directions, one of them being joined to an induction quadrant 40 (see Figure 4) and another being joined to an induction quadrant 42 also shown in Figure 4. These induction quadrants are mounted by fin plates 44 and 46 inserted in slots in the dielectric material 30 and fastened therein by cross bolts 50.

The remanider of the double coil on the right-hand side is formed by two conductive quadrants 52 and 54 which are offset from each other and connected by a conductive bar 56. These quadrants are likewise held in the block 30 by rearwardly extending fins 58 and 60 also transfixed by bolts 50.

The cooling of this half of the induction ring is accomplished by through water passages in the quadrants would result from poor or no contact.

2,826,665 Patented Mar. 11, 1958 'ice shown in arcuate dotted lines in Figure l and shown in section in Figure 8. For example, groove 62 in quadrant 40 can be fed from a groove 64 in a lead bar 24 which branches into .the groove at '66 and can discharge at 68 to a passage which leads downward at 70 to the parallel groove 74 in the lead 24. Similarly, the grooves 76 and 78 in lead bar 26 may .furnish the inlet and outlet for cooling groove 80 in quadrant 42. The quadrants 52 and54 are provided with grooves 82 and 84, respectively, connected by a passage 86 in the cross bar 56. This combination cooling duct is supplied with cooling fluid through ducts 88 and 90 leading in through the bottom and the top of the assembly. The entire jaw is mounted on a slide plate 92.

The other side of the induction ring is also mounted on a slide plate 94 and consists similarly of a block of dielectric material in which two electrically isolated half rings .100 and 102 are mounted. These half rings when brought into contact with the quadrants of the jaw 22 complete a double turn induction ring. It is essential that this ring he completed into a positive contact electrically to avoid arcing and other disadvantages which Each half ring and 102 is, therefore, mounted on a clevis rod 104 and 106 by means of rearwardly extending fin members 108 and 110 which are pivotally mounted in the clevis rods by pins 112 and 114, respectively.

As shown in Figure 2, the back surfaces of the half rings 100 and 102 are provided each with a groove 116 and with a wider adjacent groove 118. The members 108 and 110 are arcuate in one dimension and shaped to fit inside the groove 118 to close the groove 116 and make it a cooling passage in each coil portion. These cooling grooves are connected to suitable feed inlet and outlet passages 120 and 122 for cooling fluid.

The respective jaws 100 and 102 are mounted in dielectric blocks and 132, which in turn are bolted to the slide plate 94. These blocks are suitably recessed to receive the members 108 and 110 and are provided with an opening 134, in which is mounted in each block a bearing block 136 for the clevis rods 104 and 106. The clevis rods extend rearwardly to project out of the blocks 130 and 132 and have a threaded end portion with a nut 140; and inside the opening 134 around the pins 104 and 106 are springs 142, the tension of which is adjustable through nuts 144. These springs backed on the blocks 130 and 132 urge the'pins and the half rings 100 and 102 forward in the blocks.

The cooling grooves in the various quarter segments and half ring segments of the induction rings are closed at their diametric ends by silver plates which are silver soldered or brazed onto the ends of the rings to serve as contact surfaces for the rings as they come together.

It will be seen that there is thus disclosed a multiple turn split induction ring which can be separated for purposes of moving a part to be heated into position and which can be then moved together around the part. The half rings 100 and 102 are pivotally mounted and also slidably mounted so that they may meet the other half of the induction ring and upon contact will find an equilibrium position with both ends in full contact around the ring. Rings in any number could be provided with this arrangement, and full contact between all the turns of the induction coil can be assured.

I claim:

1. An induction heating ring for heat treatment and the like which comprises a plurality of conductive partial toroid members slidably movable relative to each other toward a common center to complete a toroid, and means for movably mounting at least one of said members to have a rocking motion around an axis spaced from the 3 center of the toroid, and means for biasing said members to closed position when they are moved toward the common center of the toroid.

2. An induction heating ring for heat treatment and the like which comprises a plurality of conductive partial toroid members slidably movable relative to each other toward a common center to complete a toroid between spaced parallel planes, and means for movably mounting at least one of said members to have a rocking motion between said planes around an axis spaced from the center of the toroid and parallel to the axis of the toroid, and means for biasing said members to closed position when they are moved toward the common center of the toroid.

3. A device as defined in claim 1 in which each partial toroid member has a radially extending fin, and a block of non-conductive material recessed to receive said fin for mounting said partial toroid members for movement toward and away from a common center.

4. A device as defined in claim 2 in which each partial toroid member has a radially extending fin, and a block of non-conductive material recessed to receive said fin for mounting said partial toroid members for movement toward and away from a common center.

5. A device as defined in claim 1 in which the outer surface of each partial toroid member is provided with a double slot, the inner slot being smaller than the outer slot, and a fin means for mounting said members having one edge received in said outer slot to form a closed passage of said inner slot, and means for mounting said members through said fins comprising non-conductive blocks slidably mounted and recessed to receive said fins in a fixed position.

6. A device as defined in claim 3 in which the radially extending fin of said one movably mounted member is fastened to a resiliently biased slide member.

7. A device as defined in claim 5 in which the member which is movably mounted to have a rocking motion is attached by its mounting fin to a resiliently biased plunger in a non-conductive block.

8. A device as defined in claim 1 in which the heating ring is formed of 'two semi-toroid members and one of said semi-toroid members is formed of two quadrant portions, adjacent ends of which are fastened respectively to 1 electrical leads lying substantially parallel to each other and extending radially outwardly from the toroidal length to a source of electrical potential.

9. A device as defined in claim 8 in which cooling ducts are formed in said electrical leads connected to passages within said partial toroid members.

10. A device as defined in claim 5 in which conduits containing cooling fluid are connected to opposite ends of the inner grooves on the outer surfaces of said toroidal members to supply cooling fluid to said induction heating ring.

11. A device as defined in claim 10 in which electrical leads are fastened to portions of said toroidal members and having surface grooves therein forming ingress and egress passages to the cooling grooves in said toroidal members.

12. An induction heating ring for heat treatment and the like which comprises a multiple turn toroidal member composed of a plurality of conductive partial toroid members movable toward a common center to complete a multiple turn toroid, said means comprising semi-circular toroid members fixed in non-conductive side-byside relation and a group of four quadrant toroid members positioned to match the semi-toroid members to complete an induction heating ring, two of the quadrant toroid members being connected to each other and positioned to contact diametrically opposed surfaces of one of the semi-toroid members respectively, and the other two quadrants being connected to eiectrical leads and positioned in non-conductive relation to each other to contact diametrically opposed surfaces of the semi-quadrant members respectively.

13. An induction heating ring for heat treatment and the like which comprises a multiple turn toroidal ring composed of conductive partial toroid members adapted to join electrically at diametrical planes passing through the axis of the toroid, one half of the ring being composed of electrically insulated, semi-circular toroid members, and the other half of the ring being composed of quadrant toroid members grouped to complete a doubleturn toroid, two of the quadrants in each turn being connetced to each other and two of the quadrants in each turn being connected to electrical leads.

14. An induction heating ring for heat treatment and the like which comprises a multiple turn toroidal ring composed of conductive partial toroid members adapted to join electrically at diametn'cal planes passing through the axis of the toroid, one half of the ring being composed of a plurality of electrically insulated, semi-circular toroid members, and the other half of the ring being formed of quadrant toroidal members grouped to complete the rings with the semi-circular members, two of the quadrants positioned in diflFerent quadrants of the ring in adjacent turns thereof being connected to each other and two of the quadrants in different quadrants of the circle on the end turns of the ring being connected to electrical leads.

15. A device as defined in claim 14 in which means are provided for movably mounting the semi-circular and the quadrant toroid members on opposite sides of a common center and to shift said members toward said common center, and means for mounting at least one of said groups of partial toroid members on said first means in a manner to be resiliently biased toward the other members in assembly and movable with respect to a plane passing through the axis of the toroid and bisecting the toroid to insure positive contact between mating surfaces of the partial toroid members.

References Cited in the file of this patent UNITED STATES PATENTS 

